Differential D29687 Diff 87166 sys/amd64/amd64/machdep.c

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sys/amd64/amd64/machdep.c

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freebsd4_sigreturn(struct thread td, struct freebsd4_sigreturn_args uap)		freebsd4_sigreturn(struct thread td, struct freebsd4_sigreturn_args uap)
{		{

return sys_sigreturn(td, (struct sigreturn_args *)uap);		return sys_sigreturn(td, (struct sigreturn_args *)uap);
}		}
#endif		#endif

/*		/*
		* Reset the hardware debug registers if they were in use.
		* They won't have any meaning for the newly exec'd process.
		*/
		void
		x86_clear_dbregs(struct pcb *pcb)
		{
		if ((pcb->pcb_flags & PCB_DBREGS) == 0)
		return;

		pcb->pcb_dr0 = 0;
		pcb->pcb_dr1 = 0;
		pcb->pcb_dr2 = 0;
		pcb->pcb_dr3 = 0;
		pcb->pcb_dr6 = 0;
		pcb->pcb_dr7 = 0;

		if (pcb == curpcb) {
		/*
		* Clear the debug registers on the running CPU,
		* otherwise they will end up affecting the next
		* process we switch to.
		*/
		reset_dbregs();
		}
		clear_pcb_flags(pcb, PCB_DBREGS);
		}

		/*
* Reset registers to default values on exec.		* Reset registers to default values on exec.
*/		*/
void		void
exec_setregs(struct thread td, struct image_params imgp, uintptr_t stack)		exec_setregs(struct thread td, struct image_params imgp, uintptr_t stack)
{		{
struct trapframe *regs;		struct trapframe *regs;
struct pcb *pcb;		struct pcb *pcb;
register_t saved_rflags;		register_t saved_rflags;
Show All 19 Lines	exec_setregs(struct thread td, struct image_params imgp, uintptr_t stack)
regs->tf_ss = _udatasel;		regs->tf_ss = _udatasel;
regs->tf_cs = _ucodesel;		regs->tf_cs = _ucodesel;
regs->tf_ds = _udatasel;		regs->tf_ds = _udatasel;
regs->tf_es = _udatasel;		regs->tf_es = _udatasel;
regs->tf_fs = _ufssel;		regs->tf_fs = _ufssel;
regs->tf_gs = _ugssel;		regs->tf_gs = _ugssel;
regs->tf_flags = TF_HASSEGS;		regs->tf_flags = TF_HASSEGS;

/*		x86_clear_dbregs(pcb);
* Reset the hardware debug registers if they were in use.
* They won't have any meaning for the newly exec'd process.
*/
if (pcb->pcb_flags & PCB_DBREGS) {
pcb->pcb_dr0 = 0;
pcb->pcb_dr1 = 0;
pcb->pcb_dr2 = 0;
pcb->pcb_dr3 = 0;
pcb->pcb_dr6 = 0;
pcb->pcb_dr7 = 0;
if (pcb == curpcb) {
/*
* Clear the debug registers on the running
* CPU, otherwise they will end up affecting
* the next process we switch to.
*/
reset_dbregs();
}
clear_pcb_flags(pcb, PCB_DBREGS);
}

/*		/*
* Drop the FP state if we hold it, so that the process gets a		* Drop the FP state if we hold it, so that the process gets a
* clean FP state if it uses the FPU again.		* clean FP state if it uses the FPU again.
*/		*/
fpstate_drop(td);		fpstate_drop(td);
}		}

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